Pterophyllum scalare (ter o fill' um ska lar' e)
The scientific name for the freshwater angelfish is quite descriptive. Pterophyllum is derived from the Greek word for "winged leaf" and scalare means "like a flight of stairs" in reference to the dorsal fin. It is a Latin word that can also mean "ladder". Angelfish are laterally compressed or look like a disc on edge with long fins coming out of the top and bottom and have 2 'feelers' in front of the anal or bottom fin. The tail is vertically oriented and may be ffrom scoop shovel shape to long and relatively narrow depending on the variety.